Phil
I live in Southampton too - and South Coast Tints (Ocean Village) did the tints on my GTI three weeks ago. I watched while they did it - lots of car of attention, they treated my 5 day old car with respect - and I got the impression they'd have done the same if I hadn't been there.
B pillar back cost me just under £180. Check out
www.sctints.co.uk, they have some really good videos on the site showing what they do, and if you get an online quote there's a web discount.
The tints are guaranteed for as long as I have the car, and I could choose the level on tint on the day - I picked the light one which looks really good on my Diamond Black GTI. I'll take some pics tomorrow and get them posted.